CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investments
Amortized Cost of Fixed Maturity Securities	$ 37,825.2	$ 37,386.7
Debt Securities, Available-for-sale, Allowance for Credit Loss for Fixed Maturity Securities	0.0	0.0
Allowance for credit losses for Mortgage Loans	9.3
Other Assets
Premium Receivable, Allowance for Credit Loss	32.5	34.2
Reinsurance Recoverable, Allowance for Credit Loss	$ 1.7	$ 2.3
Stockholders' Equity
Common Stock, Par Value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, Shares Authorized	725,000,000	725,000,000
Common Stock, Shares Issued	308,306,490	307,334,853
Treasury Stock, Shares at Cost	110,551,977	104,820,670